Niobium Cb-752
Niobium Cb-752 is a medium-strength niobium alloy. It uses niobium as the base metal, adding no more than 10% tungsten, zirconium and other metal elements and a small amount of carbon to form a solid solution strengthening and a small amount of ZrO2 and (Nb, Zr) C precipitation strengthening a combination of niobium alloy.
At room temperature, the strength of Nb752 is 450-600MPa, the elongation δ=20%-30%, and it still has a fairly high strength between 1000-1400°C. Because Nb752 is more sensitive to interstitial elements such as hydrogen, oxygen, nitrogen, etc., its DBTT is relatively high, and the DBTT in the welding state is generally above room temperature. Therefore, during production and use, the pollution of hydrogen, oxygen, and nitrogen must be strictly controlled, and the oxygen and nitrogen content must be controlled below 80×10^(-6).
Properties of Cb-752 alloy
Cb-752(Cb-10%W-2.5%Zr) Niobium alloy has high strength at high temperature and good ductility at room temperature
Antioxidant properties of CB752 (Nb-10W-2.5Zr)
1. Add elements with higher atomic valence than niobium, such as molybdenum, tungsten, iridium and vanadium, etc., to overcome the lack of cations in the oxide scale, so as to reduce the diffusion of oxygen through the oxide scale to the oxide and metal interface.
2. Add elements with small ionic radius, such as vanadium, molybdenum, tungsten and aluminum, etc., to reduce the volume ratio of oxide to metal and prevent oxide peeling.
3. Add a large amount of solute elements, such as molybdenum, tungsten, tantalum, titanium and hafnium, etc., to improve the mechanical properties and chemical stability of the oxide scale.
Application of the Cb-752
Cb-752 Niobium Tungsten alloy has high strength at high temperature and good plasticity at room temperature. It can be made into various materials and parts with general machining technology.
It is mainly used in space shuttle skinning, nuclear reactor engineering, jet engine parts and space power generation system thermal radiation screen and conduit
Nb752 is mainly used in the skin of the space shuttle. And it also be used in nuclear reactor engineering. Cb-752 is a conventional material used to make jet engine parts.
In addition, CB752 can be used in the manufacture of thermal radiation screens and conduits for space power generation systems as well.
